[SOLVED] QQmlListProperty and append, at, clear, count - how to use them?

So "here":http://doc.qt.io/qt-5/qqmllistproperty.html you can see QQmlListProperty. I set everything up (list of QObjects, accessible from QML) and have no idea how to call the methods "clear" etc. (yes, I handed over the pointers) from within QML. I would highly appreciate some clear instructions.

Also a very frustrated note on QML - I suggest not reading it^^: "Designing" my first window with about 2.5 buttons in it took as long as writing the approximately 2000 lines of C++ code backing up that window - the documentation is full of errors, in most cases way too brief and incomplete (I have been spoiled by Qts documentation, I admit), the language seems completely non-intuitive to me since I have to constantly look up ever-changing properties which then are described in less than ten words, without existing (or linked) examples nearby (and if there are any, they are faulty)...
I was really looking forward to QML, but after this little project is done, I will probably go back to Qt and wait for its deformed step-step-stepbrother to mature a little bit.
(I just spend several hours trying to call the "clean()"-method on my QObject-list in QML, I apologize for all the brain-damage I must have taken.)

Well, that does something - thanks so far :) . But now the program crashes when I "empty" my list (I have to assume that's what happens, even though I can't see it before the crash).

I am displaying the lists items in a ListView - it seems that doesn't get updated when I clear the list. Do you maybe have another hint to give me? I am pretty sure there is no ListView.clear(), I would have found that during my struggles yesterday. ;)

EDIT: I now know how to prevent the crash, but again the solution seems super-non-intuitive:
Instead of calling "myobject.mycustomQmlListProperty = []", which crashes the program, I have to call "ListView.model = []", even though I also set "ListView.model = myobject.mycustomQmlListProperty" not long before. This kind of fragile behavior is what puts me off about QML.

Thanks again for the help, I will mark this as solved (and probably open up more threads soon :( ).

PS:
Just to answer more of the initial question:

model.at(i) is accessed via model[i] (makes sense)model.count() can be accessed via model.lengthmodel.append() ... well, I have no idea - a couple more weeks with QML and I might know!

I read about that, and that seems to be a completely different approach. Had I read about it before having spent fifty hours with QQmlListProperty, I probably would have chosen that route instead (especially since the coding would have been familiar to me).
However, by now I am too deep into QQmlListProperty to just quit.

Do you know of any minimal (while fully functional) examples of how to use a QAbstractItemModel from QML? Or maybe you happen to at least know some buzzwords I can feed into google?